add "Customizing the container" section to SUMMARY.md
add "Customizing the container" section to SUMMARY.md
rnorth/test-containers,outofcoffee/testcontainers-java,barrycommins/testcontainers-java,testcontainers/testcontainers-java,gorelikov/testcontainers-java,testcontainers/testcontainers-java,barrycommins/testcontainers-java,testcontainers/testcontainers-java,rnorth/test-containers,gorelikov/testcontainers-java,barrycommins/testcontainers-java,gorelikov/testcontainers-java,outofcoffee/testcontainers-java,rnorth/test-containers,outofcoffee/testcontainers-java,gorelikov/testcontainers-java,barrycommins/testcontainers-java